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https://issues.apache.org/jira/browse/HIVE-20826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16680716#comment-16680716
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Hive QA commented on HIVE-20826:
--------------------------------
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12947307/HIVE-20826.3.patch
{color:red}ERROR:{color} -1 due to build exiting with an error
Test results:
https://builds.apache.org/job/PreCommit-HIVE-Build/14821/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/14821/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-14821/
Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Tests exited with: Exception: Patch URL
https://issues.apache.org/jira/secure/attachment/12947307/HIVE-20826.3.patch
was found in seen patch url's cache and a test was probably run already on it.
Aborting...
{noformat}
This message is automatically generated.
ATTACHMENT ID: 12947307 - PreCommit-HIVE-Build
> Enhance HiveSemiJoin rule to convert join + group by on left side to Left
> Semi Join
> -----------------------------------------------------------------------------------
>
> Key: HIVE-20826
> URL: https://issues.apache.org/jira/browse/HIVE-20826
> Project: Hive
> Issue Type: Improvement
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Priority: Major
> Attachments: HIVE-20826.1.patch, HIVE-20826.2.patch,
> HIVE-20826.3.patch
>
>
> Currently HiveSemiJoin rule looks for pattern where group by is on right side.
> We can convert joins which have group by on left side (assuming group by keys
> are same as join keys and none of the columns are being projected from left
> side) to LEFT SEMI JOIN by swapping the inputs. e.g. queries such as:
> {code:sql}
> explain select pp.p_partkey from (select distinct p_name from part) p join
> part pp on pp.p_name = p.p_name;
> {code}
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